New York Yankees closer Mariano Rivera met with a team of knee surgeons Monday, and the New York Post reports things didn’t go as planned.

“We ran into complications,” Fernando Cuza, Rivera’s agent, told the New York Post. “I am referring to (Yankees physician) Dr. Ahmad and (Yankees general manager) Brian Cashman for further information.”

Neither Cuza nor the Yankees would elaborate on those complications, and it remains unclear when he will have surgery.

Rivera injured his right knee Thursday while shagging balls in the outfield during batting practice at Kansas City. He was diagnosed with a torn ACL and torn meniscus and ruled out for the remainder of this season.

Most believed this would be Rivera’s final season in the majors, though the all-time saves leader announced Friday that he would return for the 2013 season. “I can’t go down like this,” he told reporters.

Prior to suffering the injury, Rivera was 1-1 with a 2.16 ERA and five saves this season.

In his 18-season major league career, Rivera is 76-58 with a 2.21 ERA and 608 saves. He also is the all-time saves leader in the postseason with 42.

With Rivera sidelined, relievers David Robertson and Rafael Soriano are expected to handle the save opportunities.

"I always try to look from within in-season for our answers," general manager Brian Cashman told the Yankees' website. "Obviously, we have closer candidates in Robertson and Soriano, so I think we have guys that can step in and try to fill in."